EP1641307B1 - A method of subscriber data control in a mobile communication network - Google Patents

A method of subscriber data control in a mobile communication network Download PDF

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Publication number
EP1641307B1
EP1641307B1 EP05090315A EP05090315A EP1641307B1 EP 1641307 B1 EP1641307 B1 EP 1641307B1 EP 05090315 A EP05090315 A EP 05090315A EP 05090315 A EP05090315 A EP 05090315A EP 1641307 B1 EP1641307 B1 EP 1641307B1
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EP
European Patent Office
Prior art keywords
subscriber data
switching center
mobile switching
mobile station
mobile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP05090315A
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German (de)
English (en)
French (fr)
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EP1641307A2 (en
EP1641307A3 (en
EP1641307A8 (en
Inventor
Takateru c/o NEC Corporation Shimbori
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NEC Corp
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NEC Corp
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Publication of EP1641307A3 publication Critical patent/EP1641307A3/en
Publication of EP1641307A8 publication Critical patent/EP1641307A8/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/06—De-registration or detaching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/24—Interfaces between hierarchically similar devices between backbone network devices

Definitions

  • the present invention relates to a subscriber data control method in a mobile communication network according to the preamble of claim 1, according to the preamble of claim 1, and more particularly to a subscriber data control method in a mobile switching center when a visitor mobile station has entered into a service area controlled by the mobile switching center.
  • the mobile communication network is constituted by a plurality of mobile switching centers as the backbone nodes of a communication network and a plurality of base stations which are controlled by the mobile switching centers and providing radio communication areas (cells).
  • a base station control unit that controls the base stations exists between each mobile switching center and each base station, but the technique related to the present invention is not directly involved in the existence of the base station control unit. Accordingly, description is made assuming that the base station control unit is contained in the mobile switching center.
  • subscriber data relating to the mobile station is registered in a mobile switching center that handles a service area in which the mobile station is normally used.
  • the subscriber data includes various data given to each mobile station individually, and made up of as the representative data, a subscriber number allocated to the mobile station, a equipment number of the mobile station, the contents of service subscribed, registered location information, and so on.
  • the mobile switching center is a backbone node of the mobile communication network, and controls a plurality of base stations which provide a plurality of radio communication areas (i.e. cells) as a service area. Therefore, there are a plurality of service areas in the mobile communication network, and each of service areas are managed and controlled by the respective mobile switching centers.
  • a mobile switching center in which subscriber data of the mobile station is registered, is called a home mobile switching center, and a service area controlled by the home mobile switching center is called a home service area.
  • a mobile station which is locating in a particular service area and its subscriber data is not registered in a mobile switching center managing the service area, is called a visitor mobile station to the mobile switching center.
  • the mobile station When a mobile station has moved from one service area to another service area, the mobile station is informed that it has moved to a different service area by broadcasting information transmitted in respective service areas. Then, the mobile station performs a location registration operation to notify the mobile communication network that the mobile station has changed the locating service area.
  • Fig. 1 is a block diagram for explaining a control operation when the mobile station moves around the mobile communication network. The structure of the figure will be described.
  • Mobile switching centers (MSCs) 1 to 3 constitute a service area H, a service area A and a service area B by base stations (BSs) 11 to In, 21 to 2n and 31 to 3n, respectively.
  • a mobile station (MS) 4 its subscriber data has been registered in the MSC 1, is moving through respective service areas.
  • the MSC 1 is called “home switching center” to the MS4 because the subscriber data of the MS 4 is registered in the MSC 1, and also the service area H is called “home service area”.
  • the MSCs 2 and 3 are mobile switching centers to which the MS4 is going to visit, respectively, they are called “destination A MSC” and “destination B MSC” to MS4.
  • the MSC 2 of the service area A which has received a notification of the location registration by the location registration signal transmitted from the MS 4 through one of base stations in the service area A, performs the location registration request operation for the MS 4.
  • the MSC 2 requests the MSC 1, which is the home MSC of the MS 4 and discriminated by a equipment number transmitted with the location registration signal, to register a new location of the MS 4 (i.e. service area A), and also request the MSC 1 to transfer the subscriber data relating to the MS 4.
  • the MSC 1 renews the location registration information of the MS 4 registered in the subscriber data, and transfers the subscriber data relating to the MS 4 to the MSC 2.
  • the MSC 2 registers the subscriber data of the MS 4 transferred from the MSC 1 as visitor subscriber data in a subscriber data storage area of visitor subscribers.
  • a call to be terminated to the MS 4, which is visiting the other service area, is first routed by the MSC 1 which is a home MSC of the MS 4, and it is discriminated that the MS 4 exists in the service area A by referring to the location registration information stored in the MSC 1. Then, the call is routed to the MSC 2.
  • the MSC 2 refers to the subscriber data stored in the subscriber data storage area of visitor subscribers, and instructs base stations in the service area A to transmit a paging signal for the MS 4.
  • the MS 4 replies to the paging signal when the equipment number of the MS 4 coincides with the equipment number designated in the paging signal, and then, the call is terminated to the MS 4 which has responded to the paging signal.
  • the MSC 2 refers to the subscriber data in response to the call request from the MS 4, and performs a call origination control in accordance with the subscriber data of the MS 4.
  • the MS 4 When the MS 4 further moves, and is entering the service area B, the MS 4 transmits the location registration signal in the same manner as the operation performed at the service area A.
  • the MSC 3 requests the MSC 1 to register the new location of the MS 4 (service area B) and to transfer the subscriber data of the MS 4.
  • the MSC 1 responds to the request, and transmits the subscriber data of the MS 4 to the MSC 3.
  • the MSC 1 When the MSC 1 knows that the service area in which the MS 4 exists has been changed, the MSC 1 transmits a subscriber data delete request to the MSC 2 to delete the subscriber data of the MS 4 which is no longer required in the service area A.
  • the MSC 2 which has received the subscriber data delete request, deletes the subscriber data of the MS 4 stored as the visitor subscriber data, and sends a delete response back to the MSC 1.
  • the subscriber data transfer request and the subscriber data delete request are frequently transferred between mobile switching centers, and also the subscriber data registration operation and the subscriber data delete operation are similarly frequently performed in each mobile switching center.
  • the service area structure in a large city area tends to form concentric circulars by each service area as shown in Fig. 2 (A) .
  • This aims for expecting such an effect that traffic in each of the service areas is dispersed more as compared with the service area structure forming the wide stretch in the X-Y axial directions as shown in Fig. 2(B) .
  • an internal processing load relating to the control operation to be performed for the movement of the mobile station is the same amount as or larger than that of the control operation for handling to a call as compared with the switching center of a fixed communication network.
  • the mobile station belonging to another service area seems to be existing in the visiting service area as far as it has performed the location registration in the visiting service area, and the subscriber data of the mobile station transmitted from the home switching center is always held in the memory area for the visitor mobile station until receiving a deleting request from the home switching center.
  • the visitor subscriber data of those mobile stations held in the mobile switching center are no longer necessary.
  • the visitor subscriber data of such mobile stations are held until the home switching center receives the location registration request of the mobile station from another mobile switching center and recognizes that the mobile station has moved to another service area, and this results in the problem that the memory area for the visitor subscriber data is used in vain.
  • the subscriber data control method comprises the following from the viewpoint of reducing the control load of the mobile switching center:
  • the call is routed to a service area in which the mobile station currently exists, and a paging signal is transmitted simultaneously from base stations in the service area to page the mobile station.
  • the service area is locally covered by a plurality of base stations (radio cell areas) over a wide area. Therefore, transmitting the paging signal from all the base stations in the service area is waist of the system resources because the mobile station is locating in only one radio cell area.
  • the service area is further divided into some radio paging areas so that one radio paging area is made up of one or plural radio cell areas, and the mobile station transmits a location registration request signal periodically at several-minute intervals (the time intervals are different according to the system) and notifies the mobile communication switching center that in which paging area the mobile station currently exists.
  • the mobile station performs periodic location registration, and if a base station that receives the periodic location registration and reports it is a BS 22, an MSC 2 recognizes that the mobile station currently exists in the cell of the BS 22. In the case where there is an incoming call to be terminated to the mobile station, the MSC 2 instructs the transmission of a paging signal only to the BS 22.
  • the above location registration for notification of the radio paging area in which the mobile station exists is only used for controlling the mobile switching center in the subject service area.
  • the mobile switching center that has received the location registration, performs processing for only renewing location information (paging area information) relating to the subject mobile station managed in the self mobile switching center if it has already received the subscriber data transferred from its home mobile switching center even if the mobile station that performed the location registration is a visitor mobile station.
  • location information paging area information
  • this location registration is a first location registration from the mobile station, the location registration request and the subscriber data transfer request are performed on the home mobile switching center as described above.
  • the mobile switching center is not provided with data sufficient to discriminate which mobile switching center is a home mobile switching center according to an equipment number received from the mobile station together with the location registration signal at the time when the location registration request and the subscriber data transfer request are performed. Accordingly, the above subscriber data request signal is transmitted to database which is commonly provided in the mobile communication network.
  • the common data base can be accessed from any mobile switching centers and is designed so as to manage whole data of the subscriber numbers, the equipment numbers and corresponding home mobile switching centers of all the mobile stations which are subscribed and registered in the mobile communication network. Then, the subscriber data request signal is transferred to the home mobile switching center discriminated through the common database.
  • the subscriber data and the subscriber data response signal sent out from the home mobile switching center are transferred directly to the mobile switching center which is an origination point of the subscriber data request signal transmission.
  • the following description is not applied to the reception and transmission of the signal through the common data base, but an initial subscriber data request signal is thus transferred.
  • the paging signal is transmitted from the base station corresponding to the radio paging area in response to the incoming call to be terminated to the mobile station.
  • the mobile station since the mobile station does not exist therein, the mobile station cannot respond to the paging signal, and therefore a processing of no response from the called subscriber is performed.
  • the subscriber data area is divided into an area for storing the subscriber data of the mobile stations originally registered and managed in the mobile switching center, and an area for storing the visitors subscriber data transferred from each of their home mobile switching centers.
  • the visitor subscriber data is made up of a data section for storing the subscriber data transferred from the home mobile switching center in correspondence with each visitor subscriber as it is, and a header section for storing various information representative of the attribute of that data, as shown in Fig. 4 .
  • the information in the header section includes an ACT flag indicating whether the subscriber data is effective or not, the latest mobile station existing cell number reported by the periodic location registration (or a mobile station existing radio paging area number), the latest time at which the periodic location registration has been reported and the discrimination information of the home mobile switching center to which the mobile station belongs.
  • an "active” state data indicative of a state in which the subscriber data is effective and presently used. Specifically, data “1” is set on the active state data. Then, an “inactive” state data indicative of a state in which the subscriber data is ineffective and presently not used.
  • the “inactive” state includes two kinds of data which will be described later, and one of "0" and "2" is set as the inactive state.
  • the mobile switching center judges the use of the subscriber data from the set data of the ACT flag before referring to the subscriber data. If the ACT flag is "active", the paging control, the call termination control or the call origination control is performed according to the subscriber data set in the data section and the mobile station existing cell number. On the other hand, if the ACT flag is "inactive", the control with respect to the subscriber is performed assuming that no subscriber exists.
  • the mobile station which was existing in a certain service area, has moved into another adjacent service area, and the mobile station performs a new location registration in the new service area, as a result of which the home mobile switching center of the mobile station recognizes that the mobile station has moved from one service area to another service area.
  • the home mobile switching center sends out a request signal for deleting the subscriber data of the mobile station which becomes unnecessary any longer to the mobile switching center of the service area in which the mobile station previously exists.
  • the mobile switching center that has received the subscriber data delete request (step 521) sets the ACT flag of the header section in the registered subscriber data at "2" and puts in the "inactive" state actually without deleting the subscriber data (step 522). Then, the mobile switching center sends back a subscriber data delete response signal to the home mobile switching center (step 523).
  • the mobile switching center that has received the location registration signal from the mobile station (step 611), discriminates whether the mobile station is a home mobile station, which is registered and managed by the own mobile switching center, or a visitor mobile station, which is registered and managed by other mobile switching center, with reference to the equipment number of the mobile station notified together with the location registration signal.
  • step 615 Yes
  • this is in a state where there has been no succeeding periodic location registration even if a predetermined given period of time or longer had elapsed from a last periodic location registration, that is, in a subscriber data delete waiting state which will be described later.
  • step 616 Yes
  • this is in a state where the mobile station exists in the service area and performing the periodical location registration request. Since the location registration request in this state is a periodic report of the radio paging area in which the mobile station exists, the mobile switching center renews the mobile station existing cell number and the registration time by the reported contents (step 618).
  • the ACT flag is "2" of "inactive” (step 616: No)
  • this is in a state where the mobile station has moved to another service area and performed the location registration in the new service area, but it is expected to come back this service area again.
  • the case where the ACT flag is "2" means that the mobile switching center keeps (not delete) the subscriber data of the mobile station, although the mobile switching center has received the subscriber data delete request from the home mobile switching center, taking a case in which the mobile station again returns to this service area into account. Therefore, the reception of the location registration request in this case means that the mobile station again returns to this service area.
  • the mobile switching center since the mobile switching center is keeping the subscriber data of the mobile station, it is unnecessary to have the subscriber data transferred from the home mobile switching center. However, since it is necessary to perform the location registration of the mobile station in the home mobile switching center, the mobile switching center transmits the subscriber data request signal to the home mobile switching center (step 619).
  • the home mobile switching center renews the location registration information of the mobile station and sends back the subscriber data response signal without adding the subscriber data. Accordingly, in the home mobile switching center, although the analysis control of the new information field increases the load relating to the control operation for transferring the subscriber data is reduced. Also, the mobile switching center, that has transmitted the subscriber data request signal, recognizes that the request signal has been normally received by the home mobile switching center by receiving the subscriber data response signal, so that it can continue the subsequent control and reduces the load of the control operation for setting the subscriber data in the visitor subscriber area.
  • the home mobile switching center renews the reported location registration information and sends back the subscriber data response signal including the subscriber data of the mobile station. Then, the mobile switching center, that has transmitted the subscriber data request signal, recognizes that the request signal has been normally received by the home mobile switching center by receiving the subscriber data response signal, and ignores the subscriber data included in subscriber data response signal and continues the subsequent control. Similarly, in this case, the load of the control operation for setting the subscriber data in the visitor subscriber area is reduced.
  • the mobile switching center when the mobile switching center has completed the report to the home mobile switching center and received the subscriber data response signal (step 620), it sets the ACT flag of the header information of the subscriber data at "1" and restores the subscriber data (step 621). Then, the mobile switching center renews the mobile station existing cell number and the registration time by the reported contents (step 622).
  • the ACT flag is set at "0" and "inactive". Then, from the viewpoint of using the resource effectively, it is not desirable to wait for the restoration by a succeeding periodic location registration indefinite because the visitor subscriber data area getting full.
  • Fig. 7 shows a process performed at predetermined time intervals though it depends on the system, and performed at time intervals (for example, intervals of from 15 to 30 minutes) proper to delete the subscriber data the ACT flag of which is set at the "0" of "inactive" state.
  • time intervals for example, intervals of from 15 to 30 minutes
  • the "active" state is continuously renewed every time the periodic location registration report (812) is obtained. However, in the case where there is no succeeding periodic location registration even if a predetermined period of time has elapsed (periodic location registration timeout: 813), the ACT flag is changed to "0" and changed to the "inactive” state (state 804). Also, in the case where the subscriber data delete request signal is received from the home mobile switching center because the mobile station having moved to another service area (814), the ACT flag is changed to "2" and changed to the "inactive” state (state 806).
  • the MSC 2 When the MS 4, whose home MSC is the MSC 1, performs the location registration in the service area of the MSC 2 (911), the MSC 2 transmits a subscriber data request signal (901) to the MSC 1 which is a home MSC of the MS 4. The MSC 1 that has received the subscriber data request signal transfers the subscriber data of the MS 4 together with the subscriber data response signal (902).
  • the MSC 2 registers the received subscriber data in the visitor subscriber data area and sets the ACT flag at "1" (912). In this state, the MS 4 can receive a communication service in the service area of the MSC 2.
  • the MSC 2 transmits the subscriber data request signal (907) to the MSC 1, and when the MSC 2 receives the subscriber data response signal (908) from the MSC 1, it restores the subscriber data of the MS 4 which has been put in the holding state and sets the ACT flag at "1" (916).
  • the above-mentioned first embodiment mode was described with the values of the ACT flag which are to be set in the header section of the subscriber data being three kinds of "0", “1” and "2".
  • This embodiment is a control method using two kinds of "0” and “1” .
  • the meanings of the respective values are identical with those in the first embodiment modes, that is, "0” is “inactive” that means a delete wait state, and "1" is "active”, that means in the operating state.
  • the MSC 2 When the MS 4 , originally registered in the MSC 1, performs the location registration in the service area of the MSC 2 (911), the MSC 2 transmits the subscriber data request signal (901) to the MSC 1 which is a home MSC of the MS 4.
  • the MSC 1 that has received the subscriber data request signal transfers the subscriber data of the MS 4 together with the subscriber data response signal (902).
  • the MSC 2 registers the received subscriber data in the visitor subscriber data area and sets the ACT flag at "1" (912). In this state, the MS 4 can receive a communication service in the service area of the MSC 2.
  • the MSC 1 (the home MSC of the MS 4) knows that the MS 4 has not already existed in the service area of the MSC 2, but the MSC 1 does not transmit to the MSC 2 the subscriber data delete request signal (905).
  • the reason is base on the following concept.
  • the mobile station performs the periodic location registration for specifying the paging area in the service area in which the mobile station is existing for a predetermined period of time
  • the state is set at the ACT flag "0" which is inactive and waiting for deletion state, and then, the subscriber data is deleted if no location registration is performed within a predetermined period of time. Accordingly, it is unnecessary to transmit the subscriber data delete request signal from the home mobile switching center to delete the subscriber data.
  • the subscriber data request signal which is to be transmitted to the home MSC, while the subscriber data is being put in the holding state may be of a conventional format or a format in which a new field indicating that the transfer of the subscriber data is unnecessary is added.
  • the subscriber data control method enables the control load on the mobile switching center relating to the visitor subscriber data processing with respect to the mobile station that frequently moves between the service areas to be reduced and also the resource of the visitor subscriber data area to be effectively used.
  • the processing load in the home mobile switching center is reduced, and also the signal transmitted and received in the mobile switching network can be deleted, thereby contributing to the resource effective use in the entire network .
  • the subscriber data of the visitor mobile station is not deleted in response to the subscriber data delete request from its home mobile switching center due to a fact that the visitor mobile station has further moved to another service area, and the state of the registered subscriber data of the visitor mobile station is set as the inactive holding state from the active state, and thereafter in the case where the visitor mobile station returns to the subject service area within a predetermined period of time and again performs the location registration, restoration of the subscriber data of the visitor mobile station can be made by only changing the state of the subscriber data from the inactive state to the active state.
  • the subscriber data delete signal may not be transmitted to each mobile switching center of the service area in which the visitor mobile station previously existed, although the change of the service area for the mobile station is detected at the home mobile switching center, the load on the home mobile switching center is reduced and it also contributes to the effective use of the resource in the entire network.
EP05090315A 1998-07-02 1999-07-02 A method of subscriber data control in a mobile communication network Expired - Lifetime EP1641307B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP18777698 1998-07-02
JP5619499 1999-03-03
JP11123171A JP3049056B1 (ja) 1998-07-02 1999-04-28 移動体通信網の加入者デ―タ制御方法
EP99250217A EP0969685A3 (en) 1998-07-02 1999-07-02 A method of subscriber data control in a mobile communication network

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP99250217A Division EP0969685A3 (en) 1998-07-02 1999-07-02 A method of subscriber data control in a mobile communication network

Publications (4)

Publication Number Publication Date
EP1641307A2 EP1641307A2 (en) 2006-03-29
EP1641307A3 EP1641307A3 (en) 2006-04-19
EP1641307A8 EP1641307A8 (en) 2006-07-05
EP1641307B1 true EP1641307B1 (en) 2010-01-27

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EP99250217A Withdrawn EP0969685A3 (en) 1998-07-02 1999-07-02 A method of subscriber data control in a mobile communication network
EP05090315A Expired - Lifetime EP1641307B1 (en) 1998-07-02 1999-07-02 A method of subscriber data control in a mobile communication network
EP06090118A Withdrawn EP1715713A3 (en) 1998-07-02 1999-07-02 A method of subscriber data control in a mobile communication network

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EP99250217A Withdrawn EP0969685A3 (en) 1998-07-02 1999-07-02 A method of subscriber data control in a mobile communication network

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EP06090118A Withdrawn EP1715713A3 (en) 1998-07-02 1999-07-02 A method of subscriber data control in a mobile communication network

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US (3) US6591101B1 (un)
EP (3) EP0969685A3 (un)
JP (1) JP3049056B1 (un)
CN (1) CN1110973C (un)
CA (1) CA2276842C (un)
DE (1) DE69941992D1 (un)

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CN1241882A (zh) 2000-01-19
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US20030190914A1 (en) 2003-10-09
CN1110973C (zh) 2003-06-04
EP1641307A3 (en) 2006-04-19
US7280827B2 (en) 2007-10-09
EP1715713A2 (en) 2006-10-25
EP0969685A2 (en) 2000-01-05
JP3049056B1 (ja) 2000-06-05
CA2276842A1 (en) 2000-01-02
CA2276842C (en) 2003-09-09
JP2000316179A (ja) 2000-11-14
EP0969685A3 (en) 2000-12-20
US20050255846A1 (en) 2005-11-17
EP1641307A8 (en) 2006-07-05
US6591101B1 (en) 2003-07-08

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